Millimeter of mercury. A millimeter of mercury is a manometric unit of pressure, formerly defined as the extra pressure generated by a column of mercury one millimetre high and now defined as precisely 7002133322387415000â 133.322387415 pascals. It is denoted by the symbol mmHg. Although not an SI unit, the millimeter of mercury is still routinely used in medicine, meteorology, aviation, and many other scientific fields. One millimeter of mercury is approximately 1 torr, which is 1/760 of standard atmospheric ...
Vitrectomy is when the eye surgeon removes the vitreous from the inside of the eye. Pars plana vitrectomy is a general term for a group of operations on the deeper part of the eye, all of which involve the removal of some or all of the vitreous â the eyeâs clear internal jelly. Pars plana vitrectomy eye surgery is sometimes done to remove eye floaters or vitreous hemorrhage inside the eyeball. In a vitrectomy, the surgeon âvacuumsâ out the normally clear, jelly-like fluid that fills the inside of the eye, the vitreous humor, with a surgical instrument called a vitrector. The vitrectomy procedure
If a floater appears directly in your line of vision, the best thing to do is move your eye around, which causes the floater to move out of the way. Often, floaters will break up or settle with time, making them less noticeable or bothersome. In rare cases where large floaters are debilitating and interfere significantly with a patientâs vision, a vitrectomy can be performed to surgically remove the vitreous gel and floaters. What Can Be Done About Retinal Tears? If your doctor diagnoses you with a retinal tear, a laser procedure or freezing treatment (cryopexy) can be performed in the office to seal the edges and significantly reduce the risk of developing a retinal detachment, which is a potentially blinding condition.